5.3. Battery
Pack
CAUTION
: There are no user serviceable components inside the GT-321. Do not
attempt to change the internal battery pack. The wrong battery pack could cause
serious damage or a fire. The GT-321 should be sent to a service center where a
factory qualified person would change and properly dispose of the battery pack.
When the battery is low enough to need charging, a “Battery Low” message is displayed
on the display and the pump will not turn on when the
<START>
key is pushed.
To charge the battery pack, connect the AC power cord from the AC to DC converter
module to an AC power outlet. The module is universal and will work with power line
voltages of 100 to 240 volts, 50 to 60 Hz. Take the plug on the end of the cord coming
from the converter module and plug it into the charger input socket on the side of the
GT-321 just below the power switch (See section 2.2 Familiarization). To fully charge a
discharged battery pack may take up to 15 hours.
The battery pack inside the GT-321 when fully charged will power the GT-321 for about
five hours of continuous use. Under normal intermittent or manual operation however,
there is considerably less battery drain and up to 10 hours of use is possible.
If the GT-321 is to be used powered by its battery pack on a daily basis, connect the
charger after each day of usage. It will not damage the battery pack to leave it
connected to the charger for long periods.
When the GT-321 is always used in an area where AC power is available. Leave the
charger connected to the GT-321.
If the GT-321 is to be stored, fully charge the battery pack first. Storing a discharged
NiCd battery for any length of time will degrade its performance.
5.4. Zero
Test
False counts caused by air leaks or spurious noise will cause errors, especially when
sampling relatively clean aerosols. A zero count test is easy to do.
Attach the zero test filter (Met One Part Number G3111) to the GT-321 inlet nozzle. The
zero filter removes 99.99% of all particles larger than 0.3 micron. The zero filter must be
large enough that it does not create a restriction and load down the small vacuum pump
inside the GT-321. Since the air passing through the GT-321 is now virtually particle
free, the output should be zero.
Select the 0.3 micron range on the GT-321 and take a sample. The result of the 1-
minute sample should be zero counts. If it does not read zero it is probably due to a leak
in the flow path inside the GT-321 or the zero filter is bad. If it is determined that there is
a leak, the GT-321 must be sent back to the factory for repair.
GT-321-9800 Rev D.doc
GT-321 Operation Manual
Page 13 of 18
AC Tool Supply
877-207-1244
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